Molecular dynamics study about the effects of random surface roughness on nanoscale boiling process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Original languageEnglish
Article number118799
Journal / PublicationInternational Journal of Heat and Mass Transfer
Volume145
Online published5 Oct 2019
Publication statusPublished - Dec 2019

Abstract

The boiling process of argon above solid copper substrates with different surface roughness levels are investigated using molecular dynamics simulations. The randomly distributed rough surface profiles are generated by a multivariable Weierstrass-Mandelbrot function. With the application of the thermostat on the solid atoms, bubble nucleated at the solid-liquid interface after experiencing a period of evaporation process. Afterwards, the bubble grew into vapor film and pushed the bulk liquid cluster away from the solid wall. It was found that the rough structures advanced the boiling inception time and increased the evaporation mass flux. The existence of cavities is favorable for bubble nuclei appearance. Besides, the heat transfer between the solid and fluid atoms become more efficient with the help of surface nanostructures. The energy exchange rate is further improved with higher surface roughness.

Research Area(s)

  • Bubble nucleation, Heat transfer, Molecular dynamics, Rapid boiling, Rough surface

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